Disk drive

Abstract

A disk drive for driving a disk is disclosed, which includes: a driving unit configured to provide a driving force onto the disk, a main circuit pattern electrically connected with the driving unit, a sensor unit configured to sense a rotation speed of the disk, a first board supporting the sensor unit, a second board supporting the first board, and a base plate supporting the second board and the driving unit. One of the first board and the second board can be a flexible board electrically connecting the sensor unit with the main circuit pattern, and the other of the first board and the second board can be a rigid board. This disk drive can be utilized to ensure the distance between the sensor unit and the disk required for a rotation sensor to measure the rotation speed of the disk.

1. A disk drive for driving a disk, the disk drive comprising:
 a driving unit configured to provide a driving force onto the disk; 
 a main circuit pattern electrically connected with the driving unit; 
 a sensor unit configured to sense a rotation speed of the disk; 
 a first board supporting the sensor unit; 
 a second board supporting the first board; 
 a base plate supporting the second board and the driving unit; and 
 a plurality of flexible boards, the flexible boards being stacked over one another, 
 wherein one of the first board and the second board is a flexible board electrically connecting the sensor unit with the main circuit pattern, and the other of the first board and the second board is a rigid board. 
 
     
     
       2. The disk drive of  claim 1 , wherein the rigid board is inserted in a hole formed in the base plate. 
     
     
       3. The disk drive of  claim 1 , wherein the first board is a flexible board, and the second board is a rigid board. 
     
     
       4. The disk drive of  claim 1 , wherein the first board is a rigid board, and the second board is a flexible board. 
     
     
       5. The disk drive of  claim 4 , wherein the sensor unit and the flexible board are electrically connected by a through-hole formed in the rigid board. 
     
     
       6. A disk drive for driving a disk, the disk drive comprising:
 a driving unit configured to provide a driving force onto the disk; 
 a main circuit pattern electrically connected with the driving unit; 
 a sensor unit configured to sense a rotation speed of the disk; 
 a first board supporting the sensor unit; 
 a second board supporting the first board; and 
 a base plate supporting the second board and the driving unit, 
 wherein one of the first board and the second board is a flexible board electrically connecting the sensor unit with the main circuit pattern, and the other of the first board and the second board is a rigid board, and 
 a thermosetting adhesive film is interposed between the flexible board and the rigid board. 
 
     
     
       7. A disk drive for driving a disk, the disk drive comprising:
 a driving unit configured to provide a driving force onto the disk; 
 a main circuit pattern electrically connected with the driving unit; 
 a sensor unit configured to sense a rotation speed of the disk; 
 a first board supporting the sensor unit; 
 a second board supporting the first board; and 
 a base plate supporting the second board and the driving unit, 
 wherein one of the first board and the second board is a flexible board electrically connecting the sensor unit with the main circuit pattern, and the other of the first board and the second board is a rigid board, 
 the flexible board comprises a conductive layer and a coverlay covering the conductive layer, and 
 the coverlay exposes a portion of the conductive layer such that the conductive layer is electrically connectable with the main circuit pattern. 
 
     
     
       8. The disk drive of  claim 7 , wherein a portion of the flexible board and the main circuit pattern are soldered together. 
     
     
       9. The disk drive of  claim 7 , wherein the main circuit pattern comprises a socket formed therein, and a portion of the flexible board is inserted in the socket.